noun Chemistry.
a property of certain elements, as carbon, sulfur, and phosphorus, of existing in two or more distinct forms; allomorphism.
Also, allotropism.

1840–50; allo- + -tropy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
allotropy or allotropism (əˈlɒtrəpɪ)
the existence of an element in two or more physical forms. The most common elements having this property are carbon, sulphur, and phosphorus
allotropism or allotropism
allotropic or allotropism
allo'tropically or allotropism

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American Heritage
Medical Dictionary

allotropism al·lot·ro·pism (ə-lŏt'rə-pĭz'əm) or al·lot·ro·py (-rə-pē)
The existence of two or more forms of an element that differ from one another in crystalline or molecular structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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